Electric charge on ionic grains

Details Electric charge on ionic grains Electric charge on ionic grains

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.219..441j&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 219, March 15, 1986, p. 441-447.

Astronomy and Astrophysics

Astronomy

2

Cosmic Dust, Electric Charge, Electric Potential, Interstellar Matter, Positive Ions, Electrostatics, Ionic Collisions, Oxides, Silicates, Surface Defects

Scientific paper

The charge and potential of small interstellar oxide grains in a variety of locations are calculated. The nature of the charge on such grains is shown to be localized at defect centres of both positive and negative character. The electrostatic potential in the vicinity of various sites is explored, and it is shown that positive ions are channelled by the electrostatic field to impact with high energy on sites of overall negative charge, even though the grains may themselves be overall positive. Thus ion-grain collisions are not suppressed in diffuse clouds where grains are normally positive. The consequences of these energetic collisions for surface reactions are briefly described.

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